integer ordered pair in combination (1 Viewer)

dan964

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It isn't exactly clear what you are asking. Nor is your reasoning coherent in places.

Reasoning (although on close inspection, doesn't look like that is what is the question
,


Second interpretation (which I think is what you are getting at)





(Have a think why don't we need to consider a=7?)



This is sufficient. (Why?). So we have (120,1); (120,119); (16,2); (16,14); (10,3); (10,7). So answer required is 6.
(excuse the informal/incompleteness of this)
 
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